You cannot use the same serial port for CAT (rig) control and FSK
keying. The reason has nothing to do with COM port sharing between
parallel rig control applications, which is the issue LP-Bridge solves.
The fundamental issue is that FSK keying and CAT control use the RS-232
signal lines in incompatible ways. You must use a different serial port
for FSK keying than the one you use for CAT control, and no port-sharing
method (LP-Bridge, com0com, VSPE) can change this. LP-Bridge will allow
you to use two rig control programs in parallel, but it will not allow
you to use one serial port in two fundamentally incompatible ways.
For FSK keying you need a one-transistor switching interface between the
RS-232 voltage levels (plus and minus 12V) on the COM port you are using
for FSK and the FSK keying input (pin 1) on the K3's ACC connector.
If you don't already have an FSK keying circuit, it would be easier to
use AFSK with MMTTY. From the operator's point of view, AFSK A on the K3
is almost indistinguishable from FSK D. The K3's transmitted signals
using AFSK are just as clean as its FSK. In fact, until relatively
recently the K3's AFSK was cleaner than its FSK. And with AFSK, no
special keying circuit is necessary. Indeed, if you are using the K3S's
USB port for rig control, I believe no new cables are needed at all.
Just tell MMTTY to use the sound card inside the K3S.
If you were using a SignaLink before, that was AFSK. You do not need the
SignaLink with the K3S, because everything it does is already provided
for inside the K3S, but apart from changing the sound card MMTTY uses,
there should be little difference between using the SignaLink and using
the K3S's internal sound card.
73,
Rich VE3KI
K4KAY wrote:
From Earl, K4KAY. I now have lp-bridge running and cat control is working
fine. I have to give credit to my friend Richard, K4KRW for his help.
I am now trying to get MMTTY going and reading other posts about using
transistor to invert the signal etc, to do FSK. I have done this with
Other rigs but also remember others saying I no longer need the signal link.
Which rtty program would be simpler. I already have MMTTY on
My computer and not successful on my first try. I assume I would use the
lp-bridge to get it on the K3s but when I assign the comport on the
Lp-bridge MMTTY tells me I have no comport.
I am open for suggestions. I prefer MMTTY but can go another route if
simpler and I want to stay with FSK with my K3s and P3 panadapter with the
VGS option.
Regards,
Earl, K4KAY
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